feat: decline pending action

tests/test_tools.py

@@ -61,6 +61,19 @@ async def test_draft_message_creates_pending_action():
     assert pending["id"] in registry.pending_actions
 
 
+@pytest.mark.asyncio
+async def test_decline_pending_action_removes_without_sending():
+    registry = ToolRegistry(FakeUEX())
+    result = await registry.draft_negotiation_message(hash="abc", message="Would you take 4500 UEC?")
+    action_id = result["pending_action"]["id"]
+
+    declined = await registry.decline(action_id)
+
+    assert declined["declined"] is True
+    assert declined["pending_action"]["id"] == action_id
+    assert action_id not in registry.pending_actions
+
+
 def test_uex_client_uses_bearer_and_secret_headers():
     client = UEXClient("https://api.uexcorp.space/2.0", secret_key="secret", bearer_token="bearer")